Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College,...
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Transcript of Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College,...
![Page 1: Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644.](https://reader036.fdocuments.us/reader036/viewer/2022062307/5514a58d550346ea6e8b5bc7/html5/thumbnails/1.jpg)
Nitrogen Use Efficiency in Vegetable Crops
Laura L. Van Eerd, Ph.D., P.Ag.
Ridgetown College, University of Guelph
519-674-1644
![Page 2: Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644.](https://reader036.fdocuments.us/reader036/viewer/2022062307/5514a58d550346ea6e8b5bc7/html5/thumbnails/2.jpg)
Methodology
• Crops: – Cucumbers– Squash– Peppers– Carrots
• 3 sites for each crop• RCBD
– 4 reps– 6 to 8 treatments
![Page 3: Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644.](https://reader036.fdocuments.us/reader036/viewer/2022062307/5514a58d550346ea6e8b5bc7/html5/thumbnails/3.jpg)
Methodology
• N treatments – 0 N – Low (35 – 65 kg N ha-1) – OMAF recommendation – High (1.5x OMAF) – Very high (2x OMAF) – Split (Low + x = OMAF rec.) – UMAXX from Agrotain
Cucumbers0
65
110
165
220
65 + 45
110
![Page 4: Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644.](https://reader036.fdocuments.us/reader036/viewer/2022062307/5514a58d550346ea6e8b5bc7/html5/thumbnails/4.jpg)
Data Collection
• Soil sampling– Pre-site analysis (soil characteristics)– 2 week after treatment (mineral N)– At split application (mineral N)
• Plant sampling – At split application (nitrate)
• Harvest– Marketable yield– Soil (mineral N)– Shoot and fruit (% total N)
![Page 5: Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644.](https://reader036.fdocuments.us/reader036/viewer/2022062307/5514a58d550346ea6e8b5bc7/html5/thumbnails/5.jpg)
Results – Marketable Yield
![Page 6: Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644.](https://reader036.fdocuments.us/reader036/viewer/2022062307/5514a58d550346ea6e8b5bc7/html5/thumbnails/6.jpg)
Results – Crop N Uptake and Removal
N Applied (kg N/ha)
Crop Uptake
(kg N/ha)
Crop Removal
(kg N/ha)
0 34.2 (3.8) 27.5 (3.6)
110 44.9 (5.7) 30.8 (2.7)
220 48.7 (2.4) 31.9 (3.2)
NUE
-
12.8 (7.2)
8.6 (2.3)
NUE = Pnf – Pn0
fertilizer applied
![Page 7: Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644.](https://reader036.fdocuments.us/reader036/viewer/2022062307/5514a58d550346ea6e8b5bc7/html5/thumbnails/7.jpg)
Ammonia-N
Results – Soil Mineral N
Nitrate-N
![Page 8: Nitrogen Use Efficiency in Vegetable Crops Laura L. Van Eerd, Ph.D., P.Ag. Ridgetown College, University of Guelph 519-674-1644.](https://reader036.fdocuments.us/reader036/viewer/2022062307/5514a58d550346ea6e8b5bc7/html5/thumbnails/8.jpg)
Cover Crops